You can try it but the little timing pin fits with some clearance slop into the holes in the cam sprocket and the small timing pin toothed gear under it.
You might get lucky and come pretty close but you need the dial gauge and Z block to mount the dial gauge to check it and be sure.. and then you may as well reset the cam timing anyway to get it as close as possible on each side.

It's not difficult at all.
All you're doing is measuring how far the intake valve is open at top dead center before the intake stroke with a dial gauge. It's usually done on cylinder number 1 and number 4.